Cockatrice and Preyton or Dragon Ogres and Shaggoth?

Preyton and Cockatrice for me.

Thematically they fit better with the Beastmen as wild creatures.

Phil Kelly when explaining the 7th/8th Beastmen book and adding forest creatures such as Ghorgon mentioned that locationally Dragon Ogres fit better with the Norse/Warriors of Chaos mostly coming from the cold/mountainous regions as part of his reasoning for not including them. That resonated with me and I prefer Dragon Ogres being separated from the Beastmen.

Preyton and Cockatrice I see as more likely to be a part of general rampaging Beastmen armies.

There are fans of both but honestly they are all a bit redundant in the Beastmen list. The jabberslyth fills the same role as the Preyton/Cockatrice. Minotaurs and Ghorgon/Cygor fill the roles of the Dragon Ogres and Shaggoth.

I agree with Preyton & Cockatrice! To be honest I've never really liked dragon ogres as a concept so easy choice for me! What are the 24 non-character options you have at the moment? In the official 7th/8th edition book I only count 15 options.

While I ideally wanted to save it as a surprise, I have the following options:

Core

• Beast Herds
• Ungor Hunters (Ungor Raiders, renamed so they don’t clash with the Raiders rule)
• Ungor Looters (Ungors with Hand Weapons and Shields so that the option is there for those who have them - KevinC introduced the idea of Ungor Hunters being able to replace their bows with hand weapons or spears and shields in his 8th errata for the 6th Edition book, which seemed a great idea at first but I noticed some significant flaws - because Ungor Hunters were given the Unruly special rule in that errata as per the rest of the 6th Edition Beastman units, you’d get a situation where on the roll of a 1, your archers would charge the enemy rather than hang back and shoot, which seemed incongruous with the lore of them harassing enemies and leading them straight into the path of Minotaurs, and also I thought Ungor Hunters would make more sense just being Skirmishers rather than Raiders, because they prefer to stand back and shoot and are not used to the thick of melee, whereas melee Ungors would of course prefer to use the Raiders rule).
• Tuskgor Chariot
• Bovigors (I wanted Minotaur tribe armies to be a possible alternative list build, and after reading some nifty lore in Matthias Eliasson’s book I liked the idea of having standard-size Beastmen that had Bloodgreed rather than Primal Fury and (my own special touch) brought back the notion of ‘two-Wound Gors’ to the army, to give a Core choice that would allow a Minotaur-themed army to become a possibility - I did also consider allowing Minotaurs to become Core with a Doombull or Gorebull general, but was wondering if that’d be OP, given how many people hate Throgg armies).
• Chaos Warhounds

• Bestigors
• Centigors
• Minotaurs
• Razorgor Chariots
• Harpies
• Razorgor Herds
• Khorngor Garmriders (I wanted to expand the Beastman side of the roster as Eliasson’s book just added loads more monsters and it just seemed to become a home for all the Chaos monsters he didn’t want to be included in his Warriors of Chaos books, and I thought of including some God-specific Beastman units - for the Khorngors I was inspired by some Raven Twin models of Beastmen riding bigger versions of Chaos Warhounds, and thought they’d be great as a Khornate Cavalry unit that charges forward and tears its enemies apart in spectacularly gory fashion) 
• Tzaangor Enlightened (including Skyfires - as per the AoS models)
• Slaangor Fiendbloods (as per the AoS models)
• Pestigor Blightlords (As per the Garmriders, I was inspired to devise my own idea of a Pestigor unit, and I thought of mounting them on ‘refugee’ Plague Toads that have escaped to the mortal realm to escape Nurgle’s persecution - I know GW tried Poxriders with Plaguebearers riding the toads, but personally I don’t consider them Canon because they were part of a Forge World creation and were replaced with Plague Drones in GW’s own rules in 8th)
• Cockatrice
• Preyton

• Chaos Spawn
• Ghorgon
• Cygor 
• Jabberslythe
• Chaos Giant
• Thickskull (this is another monster that was devised by a DeviantArtist whose concept of Albion inspired my Albion army list, and because I’m a fan of a lot of his ideas I thought it’d be only fair to include his idea of a new unit for Beastmen, and used it to replace the concept of the Ramhorn, the name of which I’m not a fan of because it clashes with the Ramhorn Helm magic item which is just made from standard rams’ horns)

 

Beastmen needs some heavy hitting units with rank so dragon ogres for moi.

Your point is definitely a valid one - ironic isn't it, that I bring back Beast Herds to try and make the army as unique as possible and the same cause comes back to bite me when I think of other ideas?

Bestigor units, standard Beast Herds and Bovigors can take marks in my rules (though I'm debating whether to give Marks to Ungor Looters and Hunters - they may be too lowly to deserve Marks). However I really wanted to expand the Beast side of the army to stop the list just becoming a menagerie for all the Chaos monsters GW doesn't want to put into Warriors of Chaos (as Eliasson's attempt pretty much became), by introducing a unique Beast unit for each specific Chaos God, and I didn't want them all to be Monstrous Infantry because too many additional Monstrous Infantry units would clash with Minotaurs. I have based Slaangors on the 6th Edition Minotaur rofile with some Slaanesh-oriented alternative rules, and Pestigor Blightlords could be reworked to be a replacement for Chaos Trolls in the Beastman list by making them particularly resilient infantry (that could be converted from Putrid Blightkings perhaps?), but that's the very maximmum number of Monstrous Infantry I'd like to see in the army. Tzaangor Enlightened/Skyfires are fine as they are (as they're not riding beasts technically, Discs are by and large inanimate), which just leaves the Khornate unit. It could be a standard infantry unit I suppose, but we already have Khornate Gors, Bovigors and Bestigors - it would have to be a particularly unique unit to avoid treading on the hooves of these units, and special could easily lead to being overpowered. It could be a chariot but we already have Tuskgor Chariots and Razorgor Chariots, which fill that side of the army well enough. The only units I can think of that would fit in a Khornate army would be a melee-based cavalry or Monstrous Cavalry unit, and I'd ideally like to avoid anything Juggernaut-related given it wouldn't fit Beastmen and Daemons and Warriors already ride them.

Thanks for the suggestions! I can certainly change the name (I agree now you mention it that it doesn't sound 'beastly' enough) and 3-wound Infantry is an interesting concept, particularly as the models are still on 40mm bases. That would hurt them in combat somewhat as they'd have to have a massive (for 40mm bases) unit 5 models wide to count ranks and would only be able to contribute 1 attack each in support, but I can have a butcher's at the Blightkings rules and adapt them to make something more beast-oriented.

Any ideas for a Khornate unit?